Personally I have used cold tap water to top up with several extract batches. I'm all grain now so I don't do it any more. But I never had any sort of bacteria problem.
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In Process - Russian Imperial Stout, Nelson Sauvin Rye IPA, Mild No.3
In Kegs - Barley Wine, Apfelwein, Wild BlackBerry Wheat, Coffee Oatmeal Porter
Gone - so many :(
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